This mount comes standard with a bevel on both sides making it ambidextrous.
The bolt pattern on our Remington 700 Long Action mount fits Long Action Remington 700 rifles (example 30-06, 300 Win mag), as well as the 740 and 40x. Despite what you may have heard, the Remington 700 mount will NOT fit your Howa 1500 or Weatherby Vanguard. The bolt pattern is similar, but the remainder of the mount (ejection port, length, etc.) renders it useless on these two guns.
The middle spread is the distance between the two middle holes, center to center, on your receiver.
This mount is available in 20 MOA.